rtl8812ae: high ping under load (or randomly)

rtl8812ae: high ping under load (or randomly)

[Olivier Crête]

Hi,

I have a rtl 8812ae PCI desktop card and I get really poor connectivity
in Linux. In particular, I get ping times that increase a lot if I use
the connection a lot.

What I noticed by comparing with my Intel-based laptop next to it is
that iwconfig always reports a rate of 866.7Mb/s, while the rate on my
laptop fluctuates in the 100-250Mb/s range. I tried forcing the rate
with iwconfig, and it seems to help a little, but it's still not good
enough. So I suspect something is wrong with the rate control?

I've played around with the various rtlwifi module options and they
don't help.

I was suggested disable ASPM, but my motherboard doesn't seem to
support ASPM at all.

On the same computer, the card works as advertised in Windows, so I'm
pretty sure it's a driver/software issue.

I'm testing with kernel 5.6.19 and linux-firmware 20200619. And the
card is a TP-Link Archer T4E.

Please let me know how I can help debug this,

-- 
Olivier Crête
olivier.crete@ocrete.ca

Re: rtl8812ae: high ping under load (or randomly)

[Olivier Crête]

Hello,

Any help on how to debug this would be greatly appreciated.

Olivier

On Mon, 2020-07-06 at 18:24 -0400, Olivier Crête wrote:
> Hi,
> 
> I have a rtl 8812ae PCI desktop card and I get really poor connectivity
> in Linux. In particular, I get ping times that increase a lot if I use
> the connection a lot.
> 
> What I noticed by comparing with my Intel-based laptop next to it is
> that iwconfig always reports a rate of 866.7Mb/s, while the rate on my
> laptop fluctuates in the 100-250Mb/s range. I tried forcing the rate
> with iwconfig, and it seems to help a little, but it's still not good
> enough. So I suspect something is wrong with the rate control?
> 
> I've played around with the various rtlwifi module options and they
> don't help.
> 
> I was suggested disable ASPM, but my motherboard doesn't seem to
> support ASPM at all.
> 
> On the same computer, the card works as advertised in Windows, so I'm
> pretty sure it's a driver/software issue.
> 
> I'm testing with kernel 5.6.19 and linux-firmware 20200619. And the
> card is a TP-Link Archer T4E.
> 
> Please let me know how I can help debug this,
> 
-- 
Olivier Crête
olivier.crete@ocrete.ca